#efcb39 as text	Ratio	AA	AA large	AAA	Fix
Aaon white	1.58:1	fail	fail	fail	AA: use #8e740b as the text (4.51:1) AAA: use #685508 as the text (7.26:1) AA: or shift the background to #575757 (4.57:1) AAA: or shift the background to #3b3b3b (7.08:1)
Aaon black	13.27:1	pass	pass	pass	Passes AAA — no fix needed.

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #efcb39 as the background.

Brands using this color

No public brand in the corpus uses this exact color yet. Extract a brand to add one.

Palettes built around it

e11d48 111111 facc15 ffffff

Tabloid

Open in tool →

Red, black and yellow on white is the loudest three-color system in print — use it when headlines are the product.

Editorial Bold Vivid

Fonts for this mood

#efcb39 reads as warm, vivid, playful. The font library is tagged with the same vocabulary:

Warm fonts →Playful fonts →Bold fonts →

mcpConnect your agent — build around #efcb39

live endpoint

Point any MCP client at the shared colors endpoint and your agent gets the same engine as this page — generate_palette, check_contrast, analyze_color — read-only, no key. Every palette it proposes comes with a /palettes/new/… link: open it, lock what you like, paste the link back.

endpointhttps://mcp.brandsweets.com/colors/mcp

claude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp

try this prompt

›analyze #efcb39 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/efcb39-c4c09c-62aacb-2a2d1f-f1ece9?lock=0&style=vibrant

Want the agent to remember your picks and write them into a living brand? Create a free BrandSweets workspace.

Machine-readable: color.md